What kind of LTFT am I shooting for on a brewed setup?

mbox · 10-17-2005, 09:49 AM

Of course I've searched but there's no difinitive answer.

I'm assuming somewhere in the -1 to -3 range is optimal, -6 is acceptable and -10 is pretty rich. Anything is the opposite direction gets lean.

Can someone please elaborate?

Current LTFT: -1.1, -10.2, -1.3, -11.7

Tweaks: Primary 15%, Secondary 80%, Incr/Decr 80%/80%

Thinking about: Primary 21%, Secondary 100%, Incr/Decr 75%/75%

GIACX
K04's
ASP 85mm MAF
Delphi 42's
Platins
Piggies
ASP Tru

lemieux@curbside · 10-17-2005, 09:58 AM

and leave sec. @ 100% .

Ah10@WMS · 10-17-2005, 10:05 AM

mbox · 10-17-2005, 10:27 AM

I was planning on logging more when I got my LTFT's in an acceptable range b/c I was getting "too rich" dtc's on both banks.

Ah10@WMS · 10-17-2005, 10:39 AM

lemieux@curbside · 10-17-2005, 10:48 AM

try an evo type intake (open element filter) the whole fueling will be different.
asp maf+stock box+ X chip = not a great combo
my 2 cents.

mbox · 10-17-2005, 11:03 AM

as far as the #'s, I'm not sure b/c I haven't done a lot of logging. Ever since I got the "too rich" dtc's, I wanted to wait and get my FT's correct and continue from there.

mbox · 10-17-2005, 11:04 AM

Mike2kS4 · 10-17-2005, 11:09 AM

If you're at .88 or higher you're too rich, You want to be between .86 and .88 throughout the range. Some cars have different readings than others, keep that in mind. With that 85mm I think you're very close to where you should be.

LTFT's are the last thing I check because all four O2 sensors are a key part of that calculation and can be off. Anything under 11% is fine for part. Idle should be pretty close.

lemieux@curbside · 10-17-2005, 11:20 AM

10-17-2005, 09:49 AM	#1
mbox AudiWorld Super User Garage is empty, add now Join Date: Jan 2005 Posts: 2,724	What kind of LTFT am I shooting for on a brewed setup? Of course I've searched but there's no difinitive answer. I'm assuming somewhere in the -1 to -3 range is optimal, -6 is acceptable and -10 is pretty rich. Anything is the opposite direction gets lean. Can someone please elaborate? Current LTFT: -1.1, -10.2, -1.3, -11.7 Tweaks: Primary 15%, Secondary 80%, Incr/Decr 80%/80% Thinking about: Primary 21%, Secondary 100%, Incr/Decr 75%/75% GIACX K04's ASP 85mm MAF Delphi 42's Platins Piggies ASP Tru

10-17-2005, 09:58 AM	#2
lemieux@curbside AudiWorld Super User Garage is empty, add now Join Date: Dec 2002 Posts: 17,781	0% or as close as possible, try -18 or -19 and the increse / decrease around 85% and leave sec. @ 100% . __________________ ************************************************ ************************************* "it's a B5 S4 ,it may break down, but its far enough ahead, by the time its fixed, you still haven't caught up." -best line i've heard AUDI B5 S4 detail info (pdf file) that everyone should read and have saved on his computer AUDI B5 RS4 study guide detail info (pdf file) FATS database VAG-COM LOCATOR ASP Hands down the "BESTEST" tuner out there.

10-17-2005, 10:05 AM	#3
Ah10@WMS AudiWorld Super User Garage is empty, add now Join Date: Aug 2000 Posts: 7,611	Have you done any logs yet? would like to see 02 value and CF and Knock __________________ WMS: 818-997-6500 ASP:856-772-9500 \|\| ASP Custom Tuned Stage 3 \|\| 710P \|\| Piggie DP \|\| ASP 89mm Truedual \|\| ASP TSB \|\| APR Boost Gauge \|\| RS4 Grille \|\| \|\| AWE Intercooler \|\| C M Stage 4, 6 puck & LWFW \|\| ASP Motor Mount \|\| RS4 Tranny Mount\|\| StaSIS Motorsport Ohlins \|\| \|\| 18" Work W-ITS 901 \|\| 245/35/18 ContiSport3 \|\| Ecode \|\| Modded RS4 Bumper \|\| StaSIS Motorsport Alcon 6pot 355 \|\| WMS Stage III: 3.54 fats on Pump 3.25 fats on Race gas both runs were on pump file 3.06 on East Coast Pump Gas/Race File 2.93 on East Coast Pump Gas/Race File in 40f weather

10-17-2005, 10:27 AM	#4
mbox AudiWorld Super User Garage is empty, add now Join Date: Jan 2005 Posts: 2,724	yeah, I have a 031 log but with old settings. I was planning on logging more when I got my LTFT's in an acceptable range b/c I was getting "too rich" dtc's on both banks.

10-17-2005, 10:39 AM	#5
Ah10@WMS AudiWorld Super User Garage is empty, add now Join Date: Aug 2000 Posts: 7,611	what kind of air box are you using? and what kind of air flow do you get? 250g/s? __________________ WMS: 818-997-6500 ASP:856-772-9500 \|\| ASP Custom Tuned Stage 3 \|\| 710P \|\| Piggie DP \|\| ASP 89mm Truedual \|\| ASP TSB \|\| APR Boost Gauge \|\| RS4 Grille \|\| \|\| AWE Intercooler \|\| C M Stage 4, 6 puck & LWFW \|\| ASP Motor Mount \|\| RS4 Tranny Mount\|\| StaSIS Motorsport Ohlins \|\| \|\| 18" Work W-ITS 901 \|\| 245/35/18 ContiSport3 \|\| Ecode \|\| Modded RS4 Bumper \|\| StaSIS Motorsport Alcon 6pot 355 \|\| WMS Stage III: 3.54 fats on Pump 3.25 fats on Race gas both runs were on pump file 3.06 on East Coast Pump Gas/Race File 2.93 on East Coast Pump Gas/Race File in 40f weather

10-17-2005, 10:48 AM	#6
lemieux@curbside AudiWorld Super User Garage is empty, add now Join Date: Dec 2002 Posts: 17,781	oh and if you have the stock airbox (it sounds like you do - with the asp maf) try an evo type intake (open element filter) the whole fueling will be different. asp maf+stock box+ X chip = not a great combo my 2 cents. __________________ ************************************************ ************************************* "it's a B5 S4 ,it may break down, but its far enough ahead, by the time its fixed, you still haven't caught up." -best line i've heard AUDI B5 S4 detail info (pdf file) that everyone should read and have saved on his computer AUDI B5 RS4 study guide detail info (pdf file) FATS database VAG-COM LOCATOR ASP Hands down the "BESTEST" tuner out there.

10-17-2005, 11:03 AM	#7
mbox AudiWorld Super User Garage is empty, add now Join Date: Jan 2005 Posts: 2,724	stock air box. as far as the #'s, I'm not sure b/c I haven't done a lot of logging. Ever since I got the "too rich" dtc's, I wanted to wait and get my FT's correct and continue from there.

10-17-2005, 11:04 AM	#8
mbox AudiWorld Super User Garage is empty, add now Join Date: Jan 2005 Posts: 2,724	should be getting one in the mail today. :-)

10-17-2005, 11:09 AM	#9
Mike2kS4 AudiWorld Super User Garage is empty, add now Join Date: Jun 2002 Posts: 12,096	I'm assuming you're at -15? What are your O2's at? If you're at .88 or higher you're too rich, You want to be between .86 and .88 throughout the range. Some cars have different readings than others, keep that in mind. With that 85mm I think you're very close to where you should be. LTFT's are the last thing I check because all four O2 sensors are a key part of that calculation and can be off. Anything under 11% is fine for part. Idle should be pretty close. __________________ 2002 S4 Avant, 6spd. Bone stock. <a href="http://www.autospeed.us"> </a> Caveat: Any advice I express regarding potential tuning and such is purely informational. If your knowledge and abilities are not up to the task, no amount of advice can assist.

10-17-2005, 11:20 AM	#10
lemieux@curbside AudiWorld Super User Garage is empty, add now Join Date: Dec 2002 Posts: 17,781	then wait for that .. and re-tweak . __________________ ************************************************ ************************************* "it's a B5 S4 ,it may break down, but its far enough ahead, by the time its fixed, you still haven't caught up." -best line i've heard AUDI B5 S4 detail info (pdf file) that everyone should read and have saved on his computer AUDI B5 RS4 study guide detail info (pdf file) FATS database VAG-COM LOCATOR ASP Hands down the "BESTEST" tuner out there.

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